The functions of antihistamine are

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(B) Antihistamines act as both antacids and antiallergic agents. They interfere with the natural action of histamine by competing with histamine for b

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Antacid and antiallergic

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(B) Antihistamines act as both antacids and antiallergic agents. They interfere with the natural action of histamine by competing with histamine for binding sites of receptors where histamine exerts its effect. For example,drugs like cimetidine are designed to prevent the interaction of histamine with the receptors present in the stomach wall,thereby acting as an antacid.

$1. \text{Serotonin}$	$2. \text{Dimetane}$
$3. \text{Phenelzine}$	$4. \text{Seldane}$

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$1. \text{Serotonin}$ $2. \text{Dimetane}$
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